Answer:
The rate of discount on the sweater is 0.25
Explanation:
Given
Regular price of the sweater , P = $36
Price at which sweater is sold after the discount , S= $27
Thus discount on sweater , D= P - S
=> D= $(36-27) = $9
Now if R is the rate of discount then
D= RxP
=>

Thus the rate of discount on the sweater is 0.25